Enhance contrast ratio for factory reset page

The current contrast ratio is lower than 4.5. Update the background
color to fix it.

Fix: 379816159
Test: visual test
Flag: EXEMPT bug fix
Change-Id: I1f896b678903966de8bffd6a371c590337c091cb

AndroidManifest.xml

@@ -5271,7 +5271,7 @@
                   android:permission="android.permission.MASTER_CLEAR"
                   android:label="@string/main_clear_title"
                   android:exported="true"
-                  android:theme="@style/SudThemeGlif.Light">
+                  android:theme="@style/SettingsSudThemeGlif.Light">
             <intent-filter>
                 <action android:name="com.android.settings.action.FACTORY_RESET"/>
                 <category android:name="android.intent.category.DEFAULT"/>
@@ -5285,7 +5285,7 @@
         <activity android:name="Settings$FactoryResetConfirmActivity"
                   android:label="@string/main_clear_confirm_title"
                   android:exported="false"
-                  android:theme="@style/SudThemeGlif.Light">
+                  android:theme="@style/SettingsSudThemeGlif.Light">
         </activity>
 
         <activity

res/values/themes.xml

@@ -247,4 +247,8 @@
         <item name="colorPrimary">@*android:color/primary_device_default_settings_light</item>
         <item name="colorAccent">@*android:color/accent_device_default_light</item>
     </style>
+
+    <style name="SettingsSudThemeGlif.Light" parent="@style/SudThemeGlif.Light">
+        <item name="android:background">@color/settingslib_materialColorSurfaceContainerLowest</item>
+    </style>
 </resources>